Wouldn't peak torque at those numbers be better while pulling? Been awhile since I've had a gas motor so I don't recall where they fall in the rpm range.
Would be nice to see them fall a little lower. Your 6.7 powerstroke make peak at something like 1,600 rpm.
However forced induction motors typically have a much flatter torque curve than naturally aspirated motors, so the ecoboost very well may make 80-90% of its peak torque at a significantly lower rpm just doesn't reach its peak till 3500 rpm.